2004 Ascender Keyless Entry

I am looking for some help with the keyless entry on the vehicle I just purchased.
Last month I bought a 2004 Isuzu Ascender that is equipped with
keyless entry. The issue was that there were no remotes for the vehicle. The dealer gave me a different remote that can be programmed to work with the Ascender, and told me to check with the garage to have it programmed. Well when I did they told me there would be a 3 to 4 week wait and a charge of $100. Now I have heard that it is possible to program the remote to work yourself. However despite all my searching I am unable to locate any information on doing so for this year/make Isuzu. If anyone out there has instructions for going about doing this, I would be greatly appreciative if you could email them or post them for me.
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